<template>
  <el-dialog
    width="500px"
    title="员工导入"
    :visible="showExcelDialog"
    @close="$emit('update:showExcelDialog', false)"
  >
    <el-row type="flex" justify="center">
      <div class="upload-excel">
        <!-- 只有input可以选中想要的文件 type=“file” -->
        <!--accept 选择接受文件类型-->
        <input
          ref="excel-upload-input"
          class="excel-upload-input"
          type="file"
          accept=".xlsx, .xls"
          @change="uploadChange"
        >
        <div class="drop">
          <i class="el-icon-upload" />
          <el-button type="text" @click="exportTemplate">下载导入模板</el-button>
          <span>将文件拖到此处或
            <el-button type="text" @click="uploadFile">点击上传</el-button>
          </span>
        </div>
      </div>
    </el-row>
    <el-row type="flex" justify="end">
      <!-- update:props属性名，值 直接修改 .sync修饰符的属性值 -->
      <el-button size="mini" type="primary" @click="$emit('update:showExcelDialog', false)">取消</el-button>
    </el-row>
  </el-dialog>
</template>
<script>
import { exportTemplateAPI, uploadExcelAPI } from '@/api/employee'
import FileSaver from 'file-saver'
export default {
  props: {
    showExcelDialog: {
      type: Boolean,
      default: false
    }
  },
  methods: {
    async exportTemplate() {
      const blob = await exportTemplateAPI()
      FileSaver.saveAs(blob, '员工导入模板.xlsx')
    },
    uploadFile() {
      this.$refs['excel-upload-input'].click() // []取值;添加click手动触发点击事件
    },
    async  uploadChange(event) {
      if (event.target.files.length) {
        try {
          const file = event.target.files[0] // 待上传的文件excel
          const data = new FormData() // 空的FormData
          // data file => 类型值是文件对象、
          data.append('file', file)
          //  API发送请求
          await uploadExcelAPI(data)
          this.$message.success('上传Excel成功')
          this.$emit('uploadSuccess') // 上传成功
          this.$emit('update:showExcelDialog', false) // 关闭弹层
        } catch (error) {
          this.$message.error(error.message)
        } finally {
          this.$refs('excel-load-input').value = '' // 不论成功与否 都把文件选择器清掉
          // //因为上传成功了文件没有必要留着了
          // 失败了更没有必要留着-在浏览器上的inputtype=file
          // 浏览器没有办法删除本地文件的
        }
      }
    }
  }
}
</script>

<style scoped lang="scss">
    .upload-excel {
      display: flex;
      justify-content: center;
      margin: 20px;
      width: 360px;
      height: 180px;
      align-items: center;
      color: #697086;
      .excel-upload-input {
        display: none;
        z-index: -9999;
      }
      .btn-upload,
      .drop {
        border: 1px dashed #dcdfe6;
        width: 100%;
        height: 100%;
        text-align: center;
        line-height: 160px;
        border-radius: 8px;
        display: flex;
        flex-direction: column;
        justify-content: center;
      }
      .drop {
        line-height: 40px;
        color: #bbb;
        i {
          font-size: 60px;
          display: block;
          color: #c0c4cc;
        }
      }
    }
</style>
